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Old 23-11-2011, 07:25 PM
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Carl is offline
Join Date: Apr 2006
Location: Alans Flat
Posts: 373
Collimation. Cheshire vs Star test

Just done some collimation tests on my GSO RC8.
In the house i used the Cheshire and got the secondary smack bang in the centre but when i did a star test looking at concentric rings when out of focus my collimatilon was way off.
So after collimating using the star test and getting even concentric rings i then looked thru the scope with my Cheshire eye peice and noticed that my secondary was way off centre.

I did a test image and my star was sharp but when i imaged at a high iso speed the star was round and sharp but had an oval flair to one side.

I'm told the only way to accurately collimate is doing a star test, fair enough. has anyone else experienced such a huge discrepency between the two?

Carl Rainer
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